I added the 6.7 air box to my 03. The lid on the box "opens" from the other side, so you need to use box and lid as well as the hose going from the box to the turbo as it is a different size on the upper end. You will also need to plug off a port near the turbo end of the hose which on a 6.7 has a smaller hose going up from there to the valve cover breather. I decide to do this for several reasons. I got the assembly free, I can get the 6.7 filters cheeper than the big 5.9 ones and I have a belt driven air compressor so having the lid "open" on the opposite side was a benefit to me. I plane on adding the cold air intake pipe out the bottom as well. David